new nige

Read lots of aux heater posts and have a couple of queries, can anyone help? The car is an Mk1 1998 AHU Ghia X aux heater pipes bypassed by previous owner, Aux heater has never worked, 3 cold children. 1) Am I correct this is a dumb unit with no controller and hence no VAG COM Connectivity to module 18 2) Blower works (no heat), is this separate from the unit you drop from under the car as per FAQ #1 page 6 or integral suggesting it has power. 3) As hoses are bypassed I was going to remove for a few weeks and strip, will this effect weathering to the car while it

does anyone know if a mk1 has a run on pump ? also why previous owner would short circut the water hoses to the rear heater to bypass it?

I just got hoses from hose world ltd 01289 386430 via post braided rubber fuel tubing 3.5mm id x 8.5mm od and 5mm id 10mm od both about

i have asked the guy who fitted the turbo today he said the EGR valve was fine and working as it should. any other ideas would be a great help i assume they replaced all the hoses when they did the turbo? if not they should do!

I would check the earth first ribbon cable behind the rear view mirror light, easy to check and can tear.

i got the electrical unit with cable and handle from a breaker for

useful Diagram at http://www.fordgalaxy.org.uk/ford/index.php?showtopic=21118 remember to post your progress

Hi can anyone give any advice on how to remove the ECU on a Mk1, I have removed the instrument cluster and can see it but cant work out how to relese it. Also cant find anything in TIS, any advice would be greatly recieved. Nige

Limp mode problems on a MK1 AHU has been bugging me for ages, I thought I would sum up on Vacuum hoses and Boost Control solenoid. I used braided rubber fuel tube 3.5mmID & 5mmID and replaced all hoses which has very nearly solved the problem. Working left to right white lines mark a)Air filter connection, :) EGR Valve, c)egr control solenoid, d) Inlet manifold tube [connects to ECU internal MAP sensor] e)Boost control solenoid [N75]. Check / replace all tubes.

Hope this works, this is a AHU e

Question, My egr valve seems to have been historicaly had the hose to it plugged, when i took it apart there didnt seem to be a blanking plate between the egr and the inlet manifold, i am not showing smoke but could this cause inlet manifold errors and error code 00575 and limp mode? I have ordered a blanking plate so might find out.

mine is the AHU engin which dosnt have VVT (i believe?)

thankyou very much, looks like a bit of hard work!

Anyone know how to get at the relays on a 98 tdi, removed facia under steering wheel but cant work out how to unfold the deeper levels of the central junction box.

yep seen that chris, suspect it a leak in the hose to the map sensor gafa tape and it seems to go away, new hose should get here tomorrow which should sort 00575. This leaves me with 65535 which ross tech suggest could be the map sensor hose at the MCU end. I will see what happens when i replace the hose. cheers

think i found it is it a 32x34mm oval formed in nominal 2-3mm mild steel plate with 4.5-5mm holes, i believe you blank on the exhust manifold side can you confirm? also if you blank the egr valve does this make the erg solinoid redundant as far as trouble shooting limp mode is concerned? nige

where do you get the plate? or do you make one up? if so do you know the size?

am i right in saying all you need to do is cut and seal the one hose leading from the egr to the egr control solonoid? Do you seal both ends?

cheers If vag com is saying 00575 intake manifold pressure either not reached, exceeded or control difference i assume its getting a manifold absolute pressure reading, as i have no specific MAP sensor error code can i assume the map sensor is OK?

For those who had had trouble with vagcom on windows vista, you can download the latest ross tech VCDS lite from their website. Using a USB lead with serial converter built in this seems to work fine using the shareware (free version) for at least engine and abs modules including clearing error codes. On another note I have limp mode turbo trouble error code 00575 I am now thinking about MAP sensors, can anyone confirm a) this is different from the N75 sensor :) clarify the various terms used to describe it and [VW & ford seem to have different terms] c) advise where the bugger is on a mk1 AHU (cylindrical thing next to N75?) and d)if they think I am barking up the wrong tree. Frustrated Newnige Cheers

Seatkid, limp mode problem on AHU, if vagcom reports error code 00575 (turbo boost) and having done vacuum hoses and N75 should I consider replacing MAF next? (I would expect a vagcom code if this was faulty) Turbo seems fine at around town speeds and on motorways when you don

I have a very similar problem; replacing vacuum hoses made a significant improvement but didn

I have had a long term turbo problem on a mk1 1.9tdi ahu, got error code 00575, changed hoses and N75 which massively improved (almost solved) the problem, did a long run and still enters limp mode at about 2800-3000 rpm (i.e. resets on ignition). Turbo seems fine when it works and trips when labouring on an up hill acceleration lane at high rpm. I note ross tech suggest turbo as a potential source (after hoses and n75) to the problem but suspect it is ok, as hoses made such a big difference. Any suggestions? Read a little about an additional hose that goes from engine compartment to mcu but believe this is mk2 related (drill hole in mcu controller to relieve pressure build up problems), can anyone confirm?

mine had flats but completely seized, careful not to damage ABS sensor wiring if you lock the flats with a spanner, I ended up junior hack sawing 3 out of 4 bolts, which actually was quite quick (say 10 min each).